Comment # 6 on bug 1190190 from Thomas Schraitle

I've just tested my theory with the upstream DocBook source of xsltproc (see
https://gitlab.gnome.org/GNOME/libxslt/-/blob/master/doc/xsltproc.xml).

This source code refers DocBook v4.1.2 (quite old). I used this command line:

/usr/bin/xsltproc \
    -o xsltproc \
    --nonet \
    --stringparam man.output.quietly 1 \
    --stringparam funcsynopsis.style "ansi" \
    /usr/share/xml/docbook/stylesheet/nwalsh/current/manpages/docbook.xsl

When I open the manpage, everything looks fine.

Using the ns variant (nwalsh -> nwalsh5), I can see the effect that was
described in comment#0.